Layout of the Fort of Santo Antônio de Gurupá, originally published in 1927 by Palma Muniz in a report about the fortification.
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This work is in the public domain both in Brazil and in the United States because it was first published in Brazil (and not published in the U.S. within 30 days) and if it was copyrightable, it was first published before 1 March 1989 without complying with U.S. copyright formalities, such as copyright notice and it is one of the following:
A work whose author died before 1936;
An anonymous work or a work deemed to be anonymous, or a work by a collective person whose authors were not individually identified, published or disclosed before 1936;
Photographic works not considered to be "artistic creations" produced before 20 June 1998. (Includes documentary photography in general (commercial or not), as well as non-artistic photographic portraits. See here for some guidance on this);
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As of 1 January 1996, were in the public domain in Brazil: Works whose author died before 1936; anonymous works, works deemed to be anonymous, or works by a collective person whose authors were not individually identified, first published or disclosed before 1936; all photographic works, and works deemed to be photographic works, which by choice of object and execution conditions couldn't be considered an artistic creation; work published or commissioned by a Brazilian government (federal, state, or municipal) prior to 1983; cinematographic, phonographic, photographic and applied arts works completed before 1936. Non artistic photographs continued entering the public domain until 20 June 1998 (not included), when Law 9.610 came into effect, 120 days after publication (pub. 20 Feb 1998).
Uploaded a work by Palma Muniz from https://fortalezas.org/index.php?ct=fortaleza&id_fortaleza=205; MUNIZ, Palma. Relatório sobre a fortaleza de Gurupá, Belém, Officinas Graphicas do Instuto Lauro Sodré, 1927 with UploadWizard